120981665461 has 4 divisors (see below), whose sum is σ = 121202839072. Its totient is φ = 120760491852.

The previous prime is 120981665423. The next prime is 120981665471. The reversal of 120981665461 is 164566189021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 164566189021 = 13 ⋅12658937617.

It is a cyclic number.

It is not a de Polignac number, because 120981665461 - 2²⁷ = 120847447733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120981665471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110585985 + ... + 110587078.

It is an arithmetic number, because the mean of its divisors is an integer number (30300709768).

Almost surely, 2^120981665461 is an apocalyptic number.

It is an amenable number.

120981665461 is a deficient number, since it is larger than the sum of its proper divisors (221173611).

120981665461 is an equidigital number, since it uses as much as digits as its factorization.

120981665461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221173610.

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 120981665461 in words is "one hundred twenty billion, nine hundred eighty-one million, six hundred sixty-five thousand, four hundred sixty-one".